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I agree with your points, except this: > thanks to the Steam Deck [...] but I would be reluctant to call that Linux Desktop anymore than I would call Android an uptick for Linux. The Steam Deck very much runs Linux Desktop. Android runs the Linux kernel, but everything else is different. SteamOS is a Linux distribution based on Arch. If you run your Steam Deck in "desktop mode", it is very much a Linux Desktop (with…
Android systems don't even run the linux kernel in any real sense, pretty much every downstream kernel has millions of lines of patched code that will never make it upstream in their current form. Of course, that's no different from mostly any other "Linux" embedded device, but it's very different indeed from what's standard on desktop systems.
Said differently: if manufacturers cared to mainstream their changes, they could. And we would all be better for it.